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3x²-18x+4x-25-3x²+8x=0
3x²-3x²-18x+4x+8x-25=0
-6x-25=0
-6x=25
6x=-25
x=_25/6
x=-4 1/6
3x² ₋ 3x² + 4x + 8x = 18 + 24
12x = 42
x = 42/12
x = 7/2